Alloy head

Because of the smooth and continuous curvature of the elliptical part of the alloy head, the stress distribution in the head is relatively uniform. The depth BT of the elliptical head depends on the ratio of the long axis to the short axis of the elliptical head, i.e. the inner diameter I of the head: the smaller the ratio of the head to the L dagger (IJ, I2h), the greater the depth of the head, and the thinner the uniform wall, but it is difficult to manufacture. Wall thickness increases. Therefore, the general value of D, I2h to not more than?. G is appropriate when I),} 2is - 2, for the Standard Oval head, it is a common pressure vessel head.

The machining method of the alloy head includes cutting, welding, heating, stamping and cleaning the alloy plate, even heating at 1000 C for 30 minutes, spinning forming, and annealing the formed components at 600 C for 60 minutes. The invention has good effect and cost saving, and can produce reliable alloy heads.

For the medium pressure vessel composed of alloy head and cylinder, such as oil tank, because of the discontinuous structure of the connection part between the head and cylinder, this part becomes one of the high stress areas. Therefore, detailed stress analysis of the joint is the content of ensuring the operation of pressure vessels. In general, the pressure vessel only bears the internal pressure, and most of the design process only calculates the thickness and checks its strength according to the internal pressure. If the head of the vessel is subjected to local external loads, such as the nozzle on the head transfers the dead load of the upper equipment, wind load, seismic load and eccentric load, etc. The load is treated as the resultant force of pressure, tension or bending moment, or several forces and moments acting on the support. At this time, the traditional theoretical calculation can not answer the influence of this force on the pressure of the head, the high stress zone between the cylinder and the head. Due to the discontinuity of geometric structure, the greater stress appears on the inner surface of the connection between the cylinder and the head of a common pressure vessel. If two symmetrical supports are added to the head, the stress concentration will occur at the joint of the bearing and the head when the bearing is subjected to certain external loads and bending moments. The larger stress will occur at the sharp angle of the connection between the bearing and the head, but the larger stress relative to the connection between the cylinder and the head is still smaller, that is, the whole container structure. The larger stress still appears in the joint between the block and the head. And the stress produced at the connection between the support and the head has little effect on the stress magnitude and distribution of the connection between the cylinder and the head. In order to improve the stress state of the connection area between the cylinder and the head, some measures can be adopted, such as designing a transition ring at the junction of the cylinder and the head.